Web-tension brake mechanism for printing-presses



T. J. BEREGH.

WEB TENSION BRAKE MECHANISM FOR PRINTING PRESSES.

AF'DLICAVONMEDIUM/12,1919.

1,342,525. PzitentedJune 8, 1920.

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. fl 22 3o J/ 29 9 29 8 n vemtoz 77/500025 J Bursa/1 3E1, 11.16 Que 1mm, 7/.

THEODORE J. JBEBEGH, OF NEW YORIL N. Y.

WEB-TENSION BRAKE MECHANISM FOR PRINTING-PRESSIS.

' Application filed m 12,

To all whom it may concern:

Beit known that f, THEODORE J. BEREGH,

va citizen of the United States, and a resident I t the brake when stopping the printing press with which the brake is associated after a predetermined amount of the supply has been exhausted; and to provide an operating mechanism which functions automatically for the accomplishment of the above stated articles.

Drawings.

Figure 1 is a schematic View showing a portion of the 'rear end of a printing press and a roll of paper or web mounted thereon and in conjunction therewith, a brake operating mechanism for controlling the speed of the spindle on which the said web is mounted.

Fig. 2 is a detail view on enlarged scale showing the construction and arrangement ball type.

of the switch by means of which the brake is controlled.

Description.

As seen in the drawings, the web roll 7 is mounted on a spindle 8 which is supported in the bearing brackets 9 usually provided on printing presses of continuous feed type. Fixedly mounted on the spindle 8 1s a sprocket wheel 10. The sprocket wheel 10 is operatively engaged with a second sprocket wheel 11- by means of a sprocket chain 12. The wheels 10 and 11 are formed in any suitable ratio to impart to the brake shaft 13, the desired rate of speed.

Mounted on thebrake shaft 13 is a brake pulley 14 and'a governor 15 of theflying- The balls of the governor 15 are ope'ratively connected to the stationary block 16 of the governor, and to a movable block 17. The block 17 is operatively, connected by a rod 18 with a slide bar 19. The slide bar 19 moves in consonance with the Specification of Letters Patent.

Patented June 8, 1920. 1919. Serial No. 310,467.

block 17 and the balls 15. Normally, the balls 15 are. drawn toward the shaft 13, and the block 17 is moved toward the inner extremlty of the said shaft by a spring 20.

The sliding rod 19 carries, permanently thereon, a supporting bar 21 at the extremities of which are wiper heads 22- and 23. The bar 19 is pivotally mounted on a slide block 24, which is held in guides 25. A pivot 26 is furnished on the block 24 to permit the bar 19 to swing. The bar 19 travels between magnets 27 and 28. When the magnet 27 is energized, the head 22 is moved over to engage the terminal buttons 29 of 1 an electric resistance 30. i The resistance 30 1s arranged 1n simulation of the rheostat,

resistance 31 by and is connected with a means of a jumper 32. The ends of the jumper are connected with the bars 33, the ends of whichbars, together with the jumper 32 connect the two resistances 30v and 31 in series. As hereinafter set forth when the magnet 28 is energized, the bar 19 is rocked on the pivot 26 to place the head 23 in engagement with the buttons 29 of the resistance 31. i

The magnets 27 and 28 are energized in conformity with the operation of the switches 34 and 35., The switches 34 and 35 are each connected with one leg of an as the negative leg of the electric mains electric supply indicated in the drawings shown. The said magnets 27 and 28 are operatively connected by the common ground 36 with the positive leg of the supply mains.

'The rod 19- has adjacent the opposite e-x tremities thereof, hooks 37 and 38. The hooks 37 and 38 pass over and engage the handle .ends of the switches 34 and 35 respectively when approaching (or moving toward the saidswitches so that when the said rods are retracted, the hooks 37 and 38 respectively operate to; move the switches 34 and 35 respectively to' their active closed positions, with the result that when the bar 19 is moving progressively over the resistances 30 and 31, the magnet 27 is energized to'place the head 22 in contact with the buttons 29 of the resistance 30, and when the rod is moved in the opposite or retrogressive direction, the magnet 28 is energized to place the head 23- in contact with the buttons 29 of the resistance 31.

Extended beyond the hooks 37 and 38 at each end of the bars 29 are push rod sec tion 39 and 40. These ends are provided so that the switch adjacent one end of the rod is closed as the switch at the opposite end is opened.

As will be seen in the drawings, the hook 38 engages the switch 35 only when the head 22 has passed over the buttons 29 and rests on the bars 33 connected with the said buttons 29 of the resistance 30. During the period of movement of the bar 19 and head 22 associated therewith which has brought the head 22 to the bars 33, the resistance 30 has been gradually added to the resistance of the current supplying a heavy magnet 41. This may be described as the normal brake operating condition, when the printing press is operating the spindle 8 under normal conditions. hen now, the bar 19 retracts, the hook 38 engages the freeend of the switch 35 and closes the said switch, thereby energizing the magnet 28, causing the bar 19 to rock on the pivot 26, with the result that the head 23 is placed in contact with the bars 33, independently connected with the buttons 29 of the resistance 31.

The current supplied to the magnet 41 is delivered by the branches 42 and 43 through the heads 22 and 23 and the resistances 30 and 31. It will be understood'that when the printing press and spindle 8 thereof is slowed down, the resistance in the current supply for the magnet 41 is increased and the pressure'applied by the said magnet to the armature 44 and the brake 45 is also in-.

creased. Vhen the governor having the balls 15 is closed, the bar 19 is moved back to the position shown in Fig. 1 of the drawings, where the head 22 rests over. the dead members 46 of the buttons 29 of the resistance 30.

It will also be observed that in this position the hook 37 has engaged the free end of the switch 34 and is ready to close the said switch with the resumption of movement of the spindle 8 and the governor on the shaft 13.

When a printing press is provided with a brake operating mechanism such as described, the operation is as follows:

Startin on the dead or inert position shown in ig. 1 of the drawings, the printing press is operated with the result that the spindle 8 is rotated. As the press gathers momentum, the web 7 rotates the spindle 8 and the shaft 13 connected therewith to open the balls of the governor 15. The block 17, rod 18 and bar 19 are moved forward as the balls open. This movement of the bar 19 .closes the switch 34 and energizes the magnet 27. This holds the bar 19 in position where the head 22 engages successively the buttons 29 of the resistance 30. The resistance 30 is gradually increased so that the pressure of the magnet 41 on the brake 45 is gradually diminished. When the normal speed of the spindle 8 is reached the rod, 19

is advanced so that the head 22 rests on the bars 33, and the hook 38 has engaged the free end of the switch 35 which .up to this time has remained open. It will be understood that during this period the roll of the web 7 has diminished and it is arranged so that the diminution has been approximately three-quarters of the original diameter when the hook 38 engages the switch 35 If after this station has been reached, and by reason of stoppage of the printing press or breaking of the web, the rotation of the spindle is slowed, the balls of the governor 15 close and the rod 19 operatively connected therewith is retracted. When the rod 19 starts to retract, the switch 35 is closed and the; switch 34 is opened by the push rod. section 39 pressing against the free end of the said switch to open it. Thus simultaneously, the magnet 27 is deenergized and the magnet 28 is energized, with the result that the sup gressively high rate of speed during the slow down or stoppage of the printing press.

When the printing press is stopped for any reason, it is obvious the supporting bar 21 is drawn to the position shown in Fig. 1 of the drawings and the switches 35 and 34 are disposed in the positions shown therein.

Ulaz'ms.

1. An apparatus as characterized comprising a mechanical braking mechanism embodying a shaft and brake member mounted thereon; a pressure shoe for said member; electrically actuated means for varying the pressure on said shoe, said means embodying an electric system including a source of supply,- and a metallic circuit incorporating a rheostat, anda. movable wiper for engaging the .sections of said rheostat, and a centrifuge actuated in correspondence with the speed of said brake, said centrifuge being operatively connected with said wiper for moving the same over said rheostat; and means operatively connected with said wiper for varying the operative relation thereof for progressively increasing theresistance of the .rheostat during the retraction of said centrifuge during the diminution of speed of said shaft. 7

2. An apparatus as characterized comprising, an electrically controlled brake; a centrifuge, operable by said brake; a reciprocating element, operatively connected with said centrifuge; an electric system for sup-- plying said brake, said system embodying a rheostat having a plurality of serially-disposed parallel sections, and a Wiper for engaging progressively, the sections of said rheostat; means for shifting said wiper from one of said sections to the other after said. Wiper has reached a predetermined point in its progression over said rheostat whereby the Wiper passes progressively over the second section of said rheostat, during the retrogression of said wiper and during the reduction of rotary speed of said centrifuge and shaft connected therewith.

3. An apparatus as characterized comprising, a rotary brake member; a fixed brake member; an electro-mechanical apparatus for varying the tension of said fixed brake member on said rotary brake member; an electric system for'supplying current to said apparatus, said system embodying a plurality of sectional resistances serially connected, and disposed in parallel arrangement,'and a reciprocating contact wiper in-' corporated in the electric system and circuit thereof, for engaging the rheostat resistance sections progressively during both the increase and the diminution of speed of said brake member; a shifting mechanism for said wiper, said mechanism embodying a plurality of magnets and operating switches therefor, said switches being operated by said wiper in correspondence with the movement of said wiper; and a centrifuge operable by said rotary brake member, said centrifuge being operatively connected with said wiper for moving the same in correspondence with the movement of said centrii'uge. p

4'. An apparatus as characterized comprising, a brake wheel operatively connected with the spindle of a paper roll; a brake shoe operatively disposed with reference to said brake wheel; an electric prime mover mover, said rheostat having a plurality of resistance loops, said loops being arranged in separated parallel groups at opposite sides of said wiper; and electro-m'echanical means operatively connected with said wiper for shifting the same from contact with one series of loops, to contact with the opposite series of loops at a predetermined point in the forward movement of said wiper.

5. An apparatus as characterized comprising, a brake wheel operatively connected with the spindle of a paper roll; a brake shoe operatively disposed with reference to said brake wheel; an electric prime mover for actuating said brake shoe; a centrifuge operatively connected with said brake wheel, said centrifuge having a reciprocating member; an electric system for supplyingsaid prime mover, said system embodying a rheostat and reciprocating wiper contact, movable thereover for varying the amount of resistance on the. line supplying said prime mover, said rheostat having a plurality of resistance loops, said loops being arranged in separated parallel groups at opposite sides of said wiper; electro-mechanical means operatively connected with said wiper for shifting the same from contact with one series of loops, to contact with the opposite series of loops at a predetermined point in the forward movement of said wiper; and means-for shifting said wiper to a neutral position on said rheostat when said brake 1 

